The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Betweenness centrality is a metric to measure the relative importance of vertices within a graph. The computation of betweenness centrality is based on shortest paths which requires O(n+m) space and O(mn) and O(nm+n2 log n) time on unweighted and weighted graphs, respectively. It is time-consuming to deal with large-scale graphs, which motivates us resort to distributed computing and parallel algorithms...
Recently, IEEE drew up a new task group named TGax to draft out the standard IEEE 802.11ax for next generation WLANs. However, the average throughput is very low due to the current medium access control (MAC) protocol. A promising solution for this problem is to draw Orthogonal Frequency Division Multiple Access (OFDMA) into IEEE 802.11ax to enable multiuser access. The key challenges of adopting...
Power states in power-scalable systems are managed to maximize performance and reduce energy waste. Power-scalable processor capabilities (e.g., Intel Turbo Boost) embrace a "faster is better" approach to power management. While these technologies can vastly improve performance and energy efficiency, there is a growing body of evidence that "faster is not always better". For example,...
With the prevalence of virtualization technology, virtual machine networks (VMN) have been widely used in host network applications. To provide fault tolerance and non-stop features to network applications and preserve the network consistency among virtual machines (VM), the distributed snapshot technique of virtual machine networks regains the attention of academia. While existing approaches still...
Virtualization is one of the main technologies currently used to deploy computing systems due to the high reliability and rapid crash recovery it offers in comparison to physical nodes. These features are mainly achieved by continuously producing snapshots of the status of running virtual machines. In earlier works, the snapshot of each individual VM is performed independently, ignoring the memory...
Physical-layer network coding (PNC) is a natural extension of network coding in wireless communication networks. PNC utilizes the addition characteristic of the electromagnetic wave rationally and improves the throughout in wireless networks significantly. This paper focuses on a key issue in PNC: the effect of pulse shaping on the performance of time synchronization errors. Analysis and simulation...
Graph data is the default data organization mechanism used in large-scale Social Network Service (SNS) applications. Traditional graph data computing models are used to dig out useful hidden information inside the data. However, the ever growing data volume is adding more and more pressures. To retrieve and discover the information, the system has to introduce a larger number of data iterations. This...
Entering the era of multi/many core processors, multithreading has been used by applications frequently to enhance performance. However, with the increasing of thread number, dynamic behaviors of thread executions become more complex as well as making performance tuning more difficult. In this paper, we present a way to analyze the performance with the communication graph which describes how threads...
Digital watermark is the effective way to realize the copyright protection, the digital watermark application with the multi-core technology is being more and more widely in embedded systems today. This paper proposes a way that NiosII dual-core realizes the digital images embedding watermarking, including the DCT algorithm, NiosII dual-core parallel processing, barrier synchronization mechanism,...
Automated Manual Transmission (AMT) technology is concerned widely in the filed of automatic transmission. However, shifting quality, in particular the gap of power interruption is one of the key issues that have not been solved. To some extent, AMT equipped with two degree of freedom electromagnetic Actuator (2-DOF EMA) will reduce the time of power interruption and improve the shift quality. The...
Heterogeneous Computing is becoming an important technology trend in HPC, where more and more heterogeneous processors are used. However, in traditional node architecture, heterogeneous processors are always used as coprocessors. Such usage increases the communication latency between heterogeneous processors and prevents the node from achieving high density. With the purpose of improving communication...
This paper focuses on synchronization of radio frequency identification (RFID) reader receivers, which plays a significant role for stability and efficiency of RFID systems. Performance of RFID reader suffers from a back-link-frequency variation of tags at a maximum of 22% according to widely used RFID standards. A new synchronization scheme employing timing recovery loop in RFID Reader Receivers...
A novel identical hyperchaotic synchronization method for a class of generalized Henon maps based on T-S fuzzy models is proposed in this paper. First, the considered generalized Henon map is represented by T-S fuzzy model equivalently. Then, based on the parallel distributed compensation technique, a fuzzy controllers is designed to realize the synchronization of the generalized Henon map. At last,...
Particle swarm optimization (PSO) algorithm is a population-based algorithm for finding the optimal solution. Because of its simplicity and high efficiency, PSO is gaining attention in solving complex and large scale problems. However, PSO often requires long execution time to solve those problems. This paper proposes a parallel PSO algorithm, called delayed exchange parallelization, which improves...
This paper proposes a high-resolution Digital-PWM (DPWM) architecture for high-frequency low-power Switching Mode Power Supply (SMPS). The proposed DPWM takes advantage of Digital Clock Manager (DCM) phase-shift characteristics available in FPGA, and combines a counter-comparator with a Multi-stAge-noise-SHaping (MASH) Delta-Sigma (Delta-Sigma) modulator. An 11-bit effective prototype DPWM along with...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.